Stereo Integrity's new HT Subwoofer - Page 44

Got over excited?

I think I pee'd a little moving all the boxes I got yesterday.

Damn phone.

This surprises me, as Nick told me they wouldn't offer this price again Good work whoever still goes to order some

Agree'd. That really doesn't sit well with me. If you're going to offer a pre order price for us "beta testers" than that's what it should be. I don't like being an early adopter who was sold on the fact that he needs to jump in now or miss out, only to find out it wasn't so special after all.

Maybe I'm too much about principle; but without them, where are we?

Exactly, I wouldn't sweat it, and really, we weren't so much beta-testers as the proto units had already demonstrated the SI's crazy value per dollar. Kudos actually to Nick and the guys for offering that price again. From a business standpoint, and now that those in circulation are getting built out, offering that price again I feel like they are going to still fly off the shelves. Speaking of which, it is now time for me to head downstairs to the theater and start EQing mine into the system... 3dB shelf filter at 40hz to bring up the low end if I need it, and some copious amounts of measurements will be my night tonight Then I plan on basking in the glory of my now FULL ON DIY speaker system

Eta 6-1-13? Are the d2's really gonna be out of stock that long?

unfortunately that is probably the case as SI will have to wait for parts hailing from the repub. of China. That is a good way out and the date might be revised down if things go as planned. My bet is that was how long it took the original order to get here, and the guys don't want to have an AE situation on their hands where they promise something too early and get everyone up in a hissy fit. Getting stuff from there to the US is a pretty blind target, it all depends on production, customs, shipping time, etc. AFAIK the 15's are still in stock and even though they aren't 18's, they are VERY substantial and GREAT for anyone wanting to build out slightly smaller enclosures for them. I still am baffled by the size differences needed for good airspace by making the jump from 15's to 18's but looking at the sd it makes sense. Still a little crazy. I am having trouble grasping 9 cuft enclosures right now for a dual opposed, as the 4 I have in right now are in 8-ish cuft boxes and I know they need more space to shine. Not much, but more.

I have to say though, just like the AE drivers, now that I have them both, they are WELL worth the wait...

If they were cheaper than the Pre order I would be upset. I'm glad they can still sell these for that price. More people getting a great deal!

Most people don't care, which is great. I don't care about them selling for the same price; I don't like pushing people into pre order pricing only to have that end up as the actual sale price.

Like I said, that's just me. The pre order guys do the dirty work, and build the hype with pics and data. That then stirs the market and sells more drivers for SI. The pre order guys should get a small break as early adopters.

If you're OK with them duping early adopters into a "pre order" price game, that's cool. I just don't believe business should be done that way and won't support them in the future (and I've purchased a lot of SI drivers over the years) Rant off.

Okay, I haven't even started constructing my theater (that'll be this summer), but my birthday's coming up so I'm thinking about asking for a pair of these. I'm not sure what I'll want to build though. The room will likely be roughly 9.5x20x8 or 11x21x8 depending on where the wife lets me put it. Anyway, not very big.

I was thinking two individual subs behind an acoustically transparent screen, but maybe a dual-opposed would be better? What would really be the benefits? Right now I have an old 15" Adire Tempest in a ported sonotube. Either way will be a big step up... and certainly overkill.

It looks like for individual boxes I'd need the d4, but for the dual-opposed I'd need the d2. Is that correct?

The sonosub was an easy build, and it looks like this are okay for downward firing. If I go with individuals, is there any good reason not to go with sonosubs again since they won't be seen?

Any opinions would be appreciated. I know I'll have to act quick if I want the d4 drivers. Thanks.

If SI can offer these prices to more people and more people get a chance at a great deal on some good woofers, i dont see why all the fuss.

Sounds like a win-win to me. Remember it is a Pre-order and there is some assumed risk in a preorder with a small company especially in this economical environment. People could just as easily lose their money if the company has a serious misfortune. A $40 discount is a very "fair" compensation for that risk IMHO.

That's true. This is basically another Pre order.

Well, FWIW, this time once again, the dirty work was done by the proto's that went out, all the while they were working on the first pre-order. They sold a LOT quicker than I think SI thought they would, so those les fortunate to get in on the first should get in on this one, cuz I am pretty sure this is the last chance you will see the $162 price-tag. Nick already stated that they were going to keep it at $190 so this is a pleasant surprise to those that didn't get in on the first round. Just sayin.


let me get to this tomorrow, but if no one else answers and I forget, PM and I will be happy to help


Actually, SI is one and the same with Obsidian Audio and Sundown for the most part, they are much more established, but more-so in the car audio realm. This was nick's first foray into HT and I have to say, now that I have 4 of my 8 running, he hit a GRAND SLAM with these drivers. All the due-diligence was done, and making the drivers more compliant while handling the inductance by tossing a ring in there, he really made a woofer worth many commercial co's attention for their future builds. I see a good future for SI/Obsidian/Sundown. You should see some of the prototypes I got to see last time I was down at the shop.......

NicksHitachi makes a great point, it's a pre-order again and there is an inherent risk so those who wish to take it should be rewarded. How many people would pre-order and pay in advance at the normal $190 price? I am guessing nobody would so this is a smart business decision by SI IMO.

i was just poking around data-bass and noticed the si-18d2 measured in series has an impedance sweep that looks more like an 8 ohm nominal driver from about 7 hz up than a 4 ohm driver. from 13hz up, it is pretty much over 6ohms everywhere.

Thanks, beast. I look forward to hearing from you. If the plan ends up to go with the individual d4 drivers I hope to get them before they're gone.

Really wanted to get in on this D2 deal.

What's the pros/cons of using the D2 vs D4 in single sealed boxes. I understand that for 2x single sealed boxes, it was suggested that I use the D4; but if I use the D2, what am I compromising?

Thanks

Depends on what amp(s) you will be running - which will be?

what is the implication? would it need more power to drive ?

Yes and No.

The higher impedance constricts how much power the amp can push through the driver(Yes).

However the driver has a reliatively high motor force, compliant suspension, and good sensitivity which means it reaches xmax pretty easy way before reaching the thermal limits of the coil.(No)

As with any driver the impedance curve shows the real power able to be pushed through the driver which is lower than the "nominal" 4ohms would suggest.

the most important difference is impedance. D4 can be wired for 8 Ohm or 2 Ohm, D2 - 1 Ohm or 4Ohm. With equal power and enclosure size the two drivers model very close down low and D2 has slightly more output above 40-50Hz. D4 is a better candidate for very large enclosures where D2 may reach excursion limits sooner.

Here is how the two look in 4cu.ft box with 1000W signal



In 0.707 alignment D4 has better LF extension. but we are talking huge boxes - 6.4 ft^3 for D2 and 12.5 ft^3 - D4. I doubt anybody will do this for sealed. But it does show the difference between the two.



D4 specs are from the sim Nick posted earlier. D2 is based on SI (Klippel) specs.


The takeaway is that in practical terms the two are very close under most circumstances and the impedance is probably the only important consideration
Edited by zheka - 1/31/13 at 7:31am

For Dual Opposed, I used 2 D4s to keep a 4ohm load on a bridged EP4000.

https://a248.e.akamai.net/pix.crutchfield.com/ca/learningcenter/car/subwoofer_wiring/2DVC_4-ohm_mono.jpg

The fact they were in stock was nice. Arrived within 2 days.

EP2500/4000

Both you guys and everyone else for that matter need to get to know this calculator and website very well:

http://www.the12volt.com/caraudio/woofer_configurations.asp

Just type in the number of drivers and which VC config you are contemplating and it will spit out any type of wiring you have the option of doing. if you are buying two drivers and are wiring for a bridged connection, type in two drivers. If you are buying two and doing a stereo setup, only enter one driver and it will show how to wire each one individually to its own channel. How should these drivers be powered?:

2 drivers: A single ep4000 wired for 4ohm mono or 2ohm stereo
4 drivers: A crown xls-5000 or cerwin vega CV5000, same as options above
8drivesr: Labgruppen clone 14k, four per channel, 4 ohm stereo


Trance,

doing a D.O. box, you will benefit from the subs getting a little extra gain (more dB) from being in the same place. If you do two seperate boxes on either side of the screen, you won't get this, but more than likely will have a much smoother bass response across all your seating positions. You have to decide which is more important to you.

This is the info I want to hear. So in the case of doing 2 dual opposed builds(4 total speakers) you could have your cake and eat it too? extra output from 2 in the same cabinet and multiple placement for smotther repsponse, right?

^ Yep, love the 12volt calc. and the generated layout graphics, very straightforward. Been using that one for a while.

Edit: I actually told myself I would not click on this thread today. There needs to be a 'Subwoofers Anonymous' group here. I'm sick, SICK!
Edited by robotbunny - 1/31/13 at 8:28am